In this section we show some of the submm-selected galaxies with the
most complete and comprehensive follow-up information, including all three
with confirmed redshifts
(Figs. 14, 18 and
19). To reveal more of the diversity of
counterparts to the SCUBA galaxies, we also show a
relatively strong radio source with a faint red K-band counterpart
(Fig. 17), two
K 19.5 galaxies,
one a formal ERO and the other with very red colors
(Smail et al., 1999;
Figs. 16 and 20),
which are likely to be the correct counterpart
on the grounds of the relatively low surface density of
EROs; and a mm-continuum source located by the
OVRO MMA at the position of a SCUBA-selected galaxy,
with a very faint K-band counterpart observed using the
NIRC instrument on the Keck telescope
(Frayer et al., 2000;
Fig. 15). Similar enigmatic faint red galaxies
have been reported as counterparts to well-located submm-selected
galaxies from other submm surveys by
Gear et al. (2000) and
Lutz et al. (2001),
while Dannerbauer et
al. (2002)
do not find counterparts to three well-located MAMBO galaxies
to a 3- limit of
Ks = 21.9.

The galaxies shown in Figs. 14 -
20 are certainly an
unrepresentative sample of submm-selected
galaxies, missing galaxies that are either intrinsically very
faint at other wavelengths or lie at the highest redshifts.
It is to be hoped that within the next few years, deep follow-up
observations, especially near-IR ground-based observations
14
and mid-IR observations using SIRTF will reveal the nature of
the majority of submm-selected galaxies.
15

Figure 14. Multi-waveband images of
SMM J02399-0136 (23 mJy;
Ivison et al., 1998;
Frayer et al., 1998).
The format of this figure is the template for those that follow.
Note that these multiwaveband figures are presented
in order of reducing 850-µm flux density, without correcting
for gravitational lensing amplification.
The leftmost panel shows black contours of 850-µm emission
superimposed on a grayscale I-band
image. The second panel shows black contours of faint 1.4-GHz
radio emission superimposed on a K-band image. These two left-hand
images are both 30 arcsec on a side. The third panel shows a
10-arcsec zoom of the K-band image (from UKIRT unless otherwise
stated;
Smail et al., 2002).
The rightmost panel shows
a B-band CFHT image in this figure; in the figures that follow this
panel shows an HST image. Here and in the figures that follow,
white contours are added to
show contrast in saturated regions of the grayscale. North is up
and East is to the left.
SMM J02399-0136 is a merging
galaxy with a confirmed optical/radio
counterpart, and a CO redshift z = 2.808: see
Vernet and Cimatti
(2001)
for a new high-quality spectrum showing
Lyman- emission
from this galaxy extended over 12 arcsec.

Figure 15. Images of
SMM J00266+1708 (18.6 mJy;
Frayer et al., 2000).
The left-hand K-band image is from UKIRT;
the right-hand K-band image is from Keck-NIRC.
The K-band detection is located at the position of the very red
galaxy M12 in a 1.1-mm continuum image obtained using the OVRO MMA.

Figure 16. Images of
SMM J09429+4658 (17.2 mJy), an ERO counterpart
(Smail et al., 1999).
Faint radio emission and extended, rather bright K-band
emission make this a good candidate for the source of the submm
emission. H1 is a low-redshift spiral galaxy in the foreground
of Abell 851.

Figure 17. Multi-waveband images of
SMM J14009+0252 (14.5 mJy), the bright
radio-detected submm galaxy
Abell 1835
(Fig. 1;
Ivison et al., 2000).
Two faint near-IR
counterparts can be seen in the K-band image. Of these, J5 is
extremely red, has no counterpart in the HST-F702W image,
and is aligned accurately with the centroid of the radio emission.

Figure 18. Multi-waveband images of
SMM J14011+0252
(12.3 mJy;
Ivison et al., 2000,
2001).
This complex merging system has a confirmed optical/radio
counterpart, and a CO redshift z = 2.565
(Frayer et al., 1999).
High-resolution CO and radio images are presented in
Ivison et al. (2001).
Note that the Northern extension of J1 is extremely red, and is close to
the centroid of the radio emission. J2 is blue, while
J1 is red. The complexity of this system is a caution against
simple treatment of extinction as a uniform screen in submm
galaxies: for a detailed discussion see
Goldader et al. (2002)
and references therein.

Figure 19. Multi-waveband images of
SMM J02399-0134
(11.0 mJy;
Kneib et al., 2002).
This ring galaxy has a confirmed optical/radio
counterpart, and a CO redshift z = 1.06. Its low redshift accounts
for its very bright K-band image and mid-IR ISO
detection at 15 µm. The other galaxy in the K-band
image is a member of Abell 370.